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Characterization of water-soluble extracts from hot-pressed poplar

Bestimmung der wasserlöslichen Extrakte von heißgepresstem Pappelholz

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Abstract

Thermal modification of wood constituents occurs upon hot-pressing of flakes during consolidation of oriented strand board (OSB). Hence, the effects of hot-pressing of hybrid poplar on water-soluble extractives were studied. Poplar veneers were pre-conditioned to 0 or 8 % moisture content and subsequently hot-pressed at 150, 200 or 250 °C. Aqueous extracts were characterized by conventional chemical methods in conjunction with chromatography (HPLC and SEC), mass spectrometry (ESI–MS) and spectroscopy (FTIR) analysis. Water-soluble fractions were markedly influenced by thermal compression treatment at 250 °C compared to the lower temperatures. Chromatographic results indicate that water-soluble extractives content increases with temperature while the degree of polymerization decreases with detection at low temperature levels. FTIR spectroscopic analysis indicates changes in aqueous-extracts composition of wood monosaccharides (hemicelluloses), meanwhile ESI–MS detected xylo-oligosaccharides. These results clearly show that heat treatment dictated the changes in each water-soluble extractive component and they respond independently with different treatment.

Zusammenfassung

Beim Heißpressen von OSB werden die Holzbestandteile in den Spänen thermisch modifiziert. Aus diesem Grund wird in dieser Studie der Einfluss des Heißpressens von Hybridpappelholz auf die wasserlöslichen Extrakte untersucht. Pappelfurniere wurden auf einen Feuchtegehalt von 0 oder 8 % konditioniert und anschließend bei einer Temperatur von 150, 200 oder 250 °C heißgepresst. Mittels konventioneller chemischer Verfahren in Verbindung mit Chromatographie (HPLC und SEC), Massenspektrometrie (ESI–MS) und Spektroskopie (FTIR) wurden die wässrigen Extrakte bestimmt. Das Heißpressen bei 250 °C hatte im Vergleich zum Pressen bei niedrigeren Temperaturen einen signifikanten Einfluss auf die wasserlöslichen Fraktionen. Die Chromatographie-Ergebnisse zeigten, dass der Gehalt an wasserlöslichen Extrakten mit der Temperatur zunimmt, wohingegen der Polymerisationsgrad bei niedrigeren Temperaturen abnimmt. Die FTIR-Analyse wies auf Änderungen in der Zusammensetzung der wässrigen Extrakte der Holzmonosaccharide (Hemicellulosen) hin. Mit ESI–MS konnten Xylo-Oligosaccharide nachgewiesen werden. Die Ergebnisse zeigten deutlich, dass sich die einzelnen wasserlöslichen Extrakte durch die Hitzebehandlung stark änderten und unterschiedlich auf die jeweiligen Behandlungen reagierten.

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Acknowledgments

The project was supported by the USDA-CSREES-National-Research-Initiative grant number 2005-35103-15277 and USDA-CSREES-Wood Utilization Research grant number 2008-34158-19486. The FTIR and HPLC were supported by USDA-CSREES-NRI grant numbers 2005-35103-15243 and 2005-35504-16083, respectively. The LCQ-Deca mass spectrometer was a gift from Thermoscientific.

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Authors and Affiliations

  1. Department of Forest, Rangeland, and Fire Sciences, Renewable Materials Program, University of Idaho, PO Box 441132, Moscow, ID, 83844, USA

    Noridah B. Osman & Armando G. McDonald

  2. Institute of Forest Utilization and Work Sciences, Albert-Ludwig University Freiburg, Freiburg im Breisgau, Germany

    Marie-Pierre G. Laborie

Authors
  1. Noridah B. Osman
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  2. Armando G. McDonald
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  3. Marie-Pierre G. Laborie
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Correspondence to Armando G. McDonald.

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Osman, N.B., McDonald, A.G. & Laborie, MP.G. Characterization of water-soluble extracts from hot-pressed poplar. Eur. J. Wood Prod. 71, 343–351 (2013). https://doi.org/10.1007/s00107-013-0686-3

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